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      24,000 BTU mini-split heat pump · MMPD Mini-Split

      Lennox MMPD024S6S-1P

      Average cooling efficiency and below average heating efficiency for a 24,000 BTU mini-split heat pump, and certified for cold climates.

      Ranks #217 of 430 24,000 BTU mini-splits for cooling efficiency, and costs about $684 a year to run in a mixed climate like Atlanta.

      SEER2
      21.6 Cooling efficiency over a season
      Average · beats 41%
      HSPF2
      9.6 Heating efficiency over a season
      Below average · beats 30%
      EER2
      12.0 Cooling efficiency on a 95°F day
      Below average · beats 25%
      Heat at 5°F
      21,600 BTU/h80% of its 47°F output
      Below average · beats 9%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 21,600 BTU/h at 5°F.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • You mainly need heat - its HSPF2 is below average for mini-splits.

      Calculate my running cost

      Details

      Specifications24,000 BTU, R-32
      General
      BrandLennox
      Also sold asSamsung
      Outdoor unit modelMMPD024S6S-1P
      SeriesMMPD Mini-Split
      TypeMini-split heat pump
      Nominal size24,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-32
      Connected (smart) capableNo
      On the market sinceSeptember 27, 2024
      Last certifiedApril 27, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better21.6 (range 16.6-21.6)
      EER2Efficiency at 95°F outdoors10.7-12.0
      Cooling capacity24,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.3-9.6
      Capacity at 47°F27,000 BTU/h
      Capacity at 17°F15,000-16,800 BTU/h
      Capacity at 5°F21,600 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80
      ENERGY STAR cold climateYes
      Heating output as it gets colder80% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with M33D024S6-1P at the standard test temperatures, in BTU/h:

      Certified matchups3 indoor units

      The same outdoor unit scores differently with each indoor unit. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitSEER2EER2HSPF2Heat @5°FAHRI ref.
      M33D024S6-1P LENNOX · cold climate21.612.09.621,600215810035
      MDDD024S6-1P LENNOX · cold climate17.511.08.721,600215810038
      MMD024S6-1P LENNOX · cold climate16.610.78.321,600216581337
      Same unit, other model numbers1

      These model numbers have exactly the same certified ratings and matchups as the Lennox MMPD024S6S-1P: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

      Yearly running cost in 10 large cities$527-$1,704

      At each state's average electricity price and the city's typical heating and cooling hours.

      Questions6
      What is the SEER2 rating of the Lennox MMPD024S6S-1P?
      The Lennox MMPD024S6S-1P is rated at up to 21.6 SEER2 and 12.0 EER2 for cooling and up to 9.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3 certified matchups SEER2 ranges from 16.6-21.6.
      Is the Lennox MMPD024S6S-1P good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 21,600 BTU/h at 5°F with a COP of 1.80, so it is still 1.8 times as efficient as electric resistance heat at that temperature.
      How much does the Lennox MMPD024S6S-1P cost to run per year?
      At its rated efficiency it costs about $527-$1,704 a year in electricity in large U.S. cities, depending on climate and local rates - for example $690 in Phoenix and $1,455 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the Lennox MMPD024S6S-1P the same as the Samsung AC024DXADCG?
      Yes, as far as the certified ratings go. ENERGY STAR lists both model numbers with identical efficiency, capacity and matchups, which means the same outdoor unit sold under a different brand or with a minor variant code (voltage, colour or region). The full list is on this page.
      Which indoor units work with the Lennox MMPD024S6S-1P?
      ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use LENNOX M33D024S6-1P, LENNOX MDDD024S6-1P, LENNOX MMD024S6-1P.
      What refrigerant does the Lennox MMPD024S6S-1P use?
      It uses R-32.

      Running cost and savings

      Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

      Heat pump $706/yrYou save $580/yrSee details ↓
      1. Where you live
      Adjust heating and cooling hours

      Filled in from your city's climate. Change them if you run the system much more or less than usual.

      2. The heat pump Lennox MMPD024S6S-1P
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $706
      Current system, per year
      $1,287
      You save per year
      $580
      Payback
      15.5 years
      Net after 10 years
      -$3,195

      Cooling $391Heating $315Electricity used: 4,413 kWhSaved vs. a minimum-efficiency heat pump: $288

      Estimates use the unit's rated SEER2 and HSPF2, full-load hours derived from NOAA 1991-2020 degree days, average residential electricity prices from the U.S. EIA (12 months to July 2026) and fuel prices from EIA (2025 for natural gas, week of 2026-10-05 for propane and heating oil). Very cold days that need backup heat are not modelled. Federal minimum for comparison: 14.3 SEER2 / 7.5 HSPF2.

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      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of April 27, 2026. How we use the data.